September 11 attacks remembered 16 years later

ARLINGTON, VA - SEPTEMBER 11: Navy sailors participate in an observance to commemorate the anniversary of the 9/11 terror attacks at the Pentagon Memorial September 11, 2017 in Arlington, Virginia. The nation marked the 16th anniversary of the terror attacks that took almost 3000 lives. (Photo by Alex Wong/Getty Images)

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ARLINGTON, VA - SEPTEMBER 11: Navy sailors participate in an observance to commemorate the anniversary of the 9/11 terror attacks at the Pentagon Memorial September 11, 2017 in Arlington, Virginia. The nation marked the 16th anniversary of the terror attacks that took almost 3000 lives. (Photo by Alex Wong/Getty Images)